<template>
  <view>
    <!-- 自定义搜索组件 -->
   <!-- <my-search :bgcolor="'pink'"  :radius="0"></my-search> -->
    <my-search @click='gotoSearch()'></my-search>
    
    <view class="scroll-view-container">
      <!-- 左侧的滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style=" {height: wh + 'px'}" >
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i === active ? 'active' : ' ']" @click="activeChange(i)">{{item.cat_name}}
          </view>
        </block>  
      </scroll-view>
       <!-- 右侧的滑动区域 -->
       <scroll-view  scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2"> 
        <!-- 二级分类的标题 -->
          <view class="cate-lv2-title"> /{{item2.cat_name}}/ </view>
          <!-- 当前二级分类下的三级分类 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon" mode=""></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
       </scroll-view>
    </view>
  </view>
</template>

<script>
  // 导入自己封装的 mixin 模块
  import badgeMix from '@/mixins/tabbar-badge.js'
  
  export default {
      // 将 badgeMix 混入到当前的页面中进行使用
      mixins: [badgeMix],
      
    data() {
      return {
        //当前设备可用高度
        wh: 0,
        cateList: [],
        active: 0,
        //二级分类的列表
        cateLevel2: [],
        scrollTop: 0,
        
        
        
      };
    },
    onLoad()
    {
     const sysInfo = uni.getSystemInfoSync()
     this.wh = sysInfo.windowHeight - 50
     
     this.getCateList()
    },
    methods:
    {
      // 获取分类列表的数据
     async getCateList()
      {
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        
        if(res.meta.status !== 200) return uni.$showMsg()
        
        this.cateList = res.message
        
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChange(i)
      {
        this.active = i
        
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList(item)
      {
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      gotoSearch()
      {
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    
    }
  }
</script>

<style lang="scss">
 .scroll-view-container
  {
  display: flex;
  
      .left-scroll-view
      {
      width: 120px;
          .left-scroll-view-item
          {
            background-color: #F7F7F7;
            line-height: 60px;
            text-align: center;
            font-size: 12px;
            
              &.active
              {
                background-color: #FFFFFF;
                position: relative;
                  
                  &::before
                  {
                    content: ' ';
                    display: block;
                    width: 3px;
                    height: 30px;
                    background-color: #C00000;
                    position: absolute;
                    top: 50%;
                    left: 0;
                    transform: translateY(-50%);
                  }
              }
          }
      }
  }
  
  .cate-lv2-title
  {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
    
  }
  
  .cate-lv3-list
  {
    display: flex;
    flex-wrap: wrap;
    
      .cate-lv3-item
      {
        width: 33.33%;
        display: flex;
        flex-direction: column;
        // 横向纵向都居中
        justify-content: center;
        align-items: center;
        margin-bottom: 10px;
        
        image
        {
          width: 60px;
          height: 60px;
        }
      }
  }
  
  
  




</style>
